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Title: Atomistic model of xenon gas bubble re-solution rate due to thermal spike in uranium oxide

Abstract

Atomistic simulations are performed to study the response of Xe gas bubbles in UO2 to ionizing fission products through the thermal spike approximation. A portion of the total electronic stopping power (Se) is taken as the thermal spike energy through a ratio variable Ζ. The thermal spike energy causes extreme melting within the fission track cylindrical region. Molecular dynamics is employed to quantify the probability of a Xe gas atom to be re-solved (re-dissolved) back into the UO2 matrix. Subsequently, a re-solution model is developed and parametrized as a function of bubble radius (R), off-centered distance (r), and thermal spike energy (ΖSe). The off-centered distance measures the shift of the thermal spike axis from the bubble center. To evaluate the re-solution model, independent fission product yield (iFPY) of U-235 fission due to thermal neutrons (0.0253 eV), taken from the JEFF-3.3 database, is used. The kinetic energy of the fission products is taken from the EXFOR database. Subsequently, the decay of Se over distance for each fission product is simulated. Finally, the evaluated re-solution rate (re-solution probability per second) is presented as a function of bubble radius for a range of Ζ.

Authors:
ORCiD logo [1];  [2];  [1]; ORCiD logo [1]; ORCiD logo [2];  [2];  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1484655
Alternate Identifier(s):
OSTI ID: 1465608; OSTI ID: 1495335
Report Number(s):
LA-UR-18-24919; PNNL-SA-135027
Journal ID: ISSN 0021-8979
Grant/Contract Number:  
89233218CNA000001; AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 7; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; xenon bubble re-solution, re-solution rate model, thermal spike, fission gas, uranium oxides, Molecular Dynamcis

Citation Formats

Setyawan, Wahyu, Cooper, Michael W. D., Roche, Kenneth J., Kurtz, Richard J., Uberuaga, Blas P., Andersson, David A., and Wirth, Brian D. Atomistic model of xenon gas bubble re-solution rate due to thermal spike in uranium oxide. United States: N. p., 2018. Web. doi:10.1063/1.5042770.
Setyawan, Wahyu, Cooper, Michael W. D., Roche, Kenneth J., Kurtz, Richard J., Uberuaga, Blas P., Andersson, David A., & Wirth, Brian D. Atomistic model of xenon gas bubble re-solution rate due to thermal spike in uranium oxide. United States. https://doi.org/10.1063/1.5042770
Setyawan, Wahyu, Cooper, Michael W. D., Roche, Kenneth J., Kurtz, Richard J., Uberuaga, Blas P., Andersson, David A., and Wirth, Brian D. Tue . "Atomistic model of xenon gas bubble re-solution rate due to thermal spike in uranium oxide". United States. https://doi.org/10.1063/1.5042770. https://www.osti.gov/servlets/purl/1484655.
@article{osti_1484655,
title = {Atomistic model of xenon gas bubble re-solution rate due to thermal spike in uranium oxide},
author = {Setyawan, Wahyu and Cooper, Michael W. D. and Roche, Kenneth J. and Kurtz, Richard J. and Uberuaga, Blas P. and Andersson, David A. and Wirth, Brian D.},
abstractNote = {Atomistic simulations are performed to study the response of Xe gas bubbles in UO2 to ionizing fission products through the thermal spike approximation. A portion of the total electronic stopping power (Se) is taken as the thermal spike energy through a ratio variable Ζ. The thermal spike energy causes extreme melting within the fission track cylindrical region. Molecular dynamics is employed to quantify the probability of a Xe gas atom to be re-solved (re-dissolved) back into the UO2 matrix. Subsequently, a re-solution model is developed and parametrized as a function of bubble radius (R), off-centered distance (r), and thermal spike energy (ΖSe). The off-centered distance measures the shift of the thermal spike axis from the bubble center. To evaluate the re-solution model, independent fission product yield (iFPY) of U-235 fission due to thermal neutrons (0.0253 eV), taken from the JEFF-3.3 database, is used. The kinetic energy of the fission products is taken from the EXFOR database. Subsequently, the decay of Se over distance for each fission product is simulated. Finally, the evaluated re-solution rate (re-solution probability per second) is presented as a function of bubble radius for a range of Ζ.},
doi = {10.1063/1.5042770},
journal = {Journal of Applied Physics},
number = 7,
volume = 124,
place = {United States},
year = {Tue Aug 21 00:00:00 EDT 2018},
month = {Tue Aug 21 00:00:00 EDT 2018}
}

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